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is complete, you can do the interactive test. There are no
surface tests. The graphic shows a list of the systems that have
an LRU replacement test.
Land Verify Test
This is a test to do a check of as many autoland sensors and
hardware as possible. This test also looks at the systems that
the crew can use in a dual channel operation.
MCP Tests
This test does a check of the interface between the MCP and the
FCC. It also does a check of the operation of the MCP switches
and displays.
Rigging Tests
These tests let you read sensor data without the use of extra
test equipment. The rigging tests verify the correct alignment of
these components:
* Control surfaces
* Autopilot actuators
* Position sensors.
You can do rigging tests of the components for these functions:
* Elevator (group 51)
* Aileron (group 52)
* Flaps (group 53)
* Stabilizer (group 54)
* CWS (group 55)
* Mach trim (group 57).
Sensor Values
BITE allows you to see the analog position sensor values. You
can measure some discrete signals and read some digital data
words. You can also do a check of the option program pins.
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General
To select the DFCS BITE test, push LSK 2L of the MAINT BITE
INDEX page. When you push this key, FCC A and FCC B tries to
go into the BITE mode. One FCC, usually FCC A becomes the
master FCC and the other FCC becomes the slave FCC. If one
FCC or both FCCs cannot get into BITE, a failure displays shows
on the CDU.
Master FCC Cannot Enter BITE
If the master FCC cannot enter BITE, the lower left BITE page
shows on the CDU. One of these messages shows on the CDU
to tell the operator why it could not enter BITE:
* A/P-A ENGAGED (J4A-55)
* A/P-B ENGAGED (J2A-17)
* CAS ABOVE 60 KNOTS AND GND SPEED ABOVE 40 KNOTS
FROM ADIRU#1/2
* AIR/GND SW INDICATES AIR MODE (J1A-42)
* NO FMC BITE REQUEST.
Pull the circuit breaker for the master FCC and push the INIT
REF key on the CDU to try the test again.
Master FCC Enters BITE, But Non-Master Does Not
If the master FCC goes into BITE and the non-master FCC does
not, the lower center BITE page shows on the CDU. One of
these messages also shows on the CDU:
* CHANNEL B NOT POWERED OR CROSS CHANNEL BUSES
FAIL
* CAS ABOVE 60 KNOTS AND GND SPEED ABOVE 40 KNOTS
FROM ADIRU#1/2
* AIR/GND SW INDICATES AIR MODE (J1A-42)
* NO FMC BITE REQUEST.
* FCC-A(B) TO MCP BUS FAILURE.
Neither FCC Can Send BITE Messages to the FMC
If neither FCC can send the BITE messages to the FMC, the
lower right BITE page shows on the CDU. The DFCS BITE does
not operate and the maintenance person needs to check the
FCCs or the interface between the FCCs and the FMC.
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DFCS - TRAINING INFORMATION POINT - DFCS BITE PAGES - FCC BITE ENTRY FAILURE
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General
If FCC A and FCC B can enter BITE, the CDU shows that the
DFCS is in the selftest mode. The DFCS selftest has an FCC A
selftest and an FCC B selftest. There is also a test of the cross
channel buses. After the selftest, the CDU shows one of these
pages:
* DFCS BITE TEST MAIN MENU
* FCC-A/B SELFTEST PASS, CROSS CHANNEL TEST FAIL
* FCC-A/B SELFTEST FAIL, CROSS CHANNEL TEST PASS.
DFCS BITE MAIN MENU Page
This page lets you choose a fault isolation or verification test.
FCC-A/B SELFTEST PASS, CROSS CHANNEL TEST FAIL Page
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